How to use a multimeter simple measurement of water pump motor fault method
We know that there are single-phase asynchronous motors and three-phase asynchronous motors for water pump motors. These two types of motors in the maintenance and inspection methods will be slightly different, the following with friends to discuss how to use a multimeter to simply measure the fault of the water pump motor.
For single-phase water pump motor measurement method
Single-phase water pump motor is generally used in rural households and agricultural small water conservancy station more, because the single-phase motor winding is composed of the main winding and secondary winding, winding DC resistance is generally in a few ohms to dozens of ohms, because the single-phase motor of the main winding and the secondary winding of their resistance is not the same. For the main winding, it uses a relatively thick wire diameter, its resistance value is relatively small, while the secondary winding with a thin line, of course, the resistance value will be large. Therefore, we use a multimeter to measure the resistance of the motor's main winding and secondary winding can determine whether the motor winding is faulty.
For example, I once repaired a double drum washing machine motor at home, when the washing machine in the dehydration of its dehydration motor speed is low, at that time I mainly suspect that the motor of the two problems, one is the washing machine dehydration motor start capacitor may fail; the other is the motor stator windings may have a local short-circuit. Both of these situations may cause the motor speed slows down and manifested as the motor "no power". I first use a multimeter to check the capacitance, and then check the dehydration motor stator winding whether there is a local short circuit phenomenon. I put the resistance gear to RX10 block, to measure the motor running winding and start winding DC resistance, according to experience, under normal circumstances, for 30 watts to 45 watts of single-phase motor its group winding is generally in the 60 ohms to 90 ohms, then the secondary winding resistance value is generally in the 100 ohms to 160 ohms between. In general, the resistance of the secondary winding is about 60 per cent greater than that of the main winding.
